Blowing device



Jan. 17, w. A. SMITH BLOWING DEVICE Filed Oct. 12. 1926 Patented Jan.17, 1928.

UNITED STATES,

v 1,656,540- PATENT oF Ficr.

WILLIAM A. SMITH, 0F SAYBE, PENNSYLVANIA, ASSIGNOR TO INGEREOliL-RANDCOMPANY, OF JERSEY CITY, NEW JERSEY, A, CORPORATION OF NEW JERSEY.

BLOVT IN G DEVICE.

Application filed October 12, 1926. Serial No. 141,151.-

ment which the invention may assume in practice, c

Figure l is a longitudinal sect10nal elevation of a rock drill havingthe invention applied thereto, and

Figure 2 is a similar view showing the position of the operation. 4

Referring to the drawings, A represents a cylinder closed at itsrearward end by a head B and being provided with a reciprocatory hammerpiston C. A front head D abuts the front end of the cylinderA and may beattached thereto in operative position in any suitable manner,preferably by the usual spring pressed side bolts (not shown). The fronthead D and the front end of the cylinder A form a housing for the chuckmechanism comprising in this in stance, a chuck jaw E in the front endof parts during the blowing the front head, a chuck F interlocked withthe chuck jaw E and a chuck nut G- interlocked with the chuck F,,saidchuck nut being provided with inwardly extending ribs H which interlockslidably with flutes J formed in an extension K of the piston C. Abushing L disposed in the cylinder A forms a closure for the front endof the cylinder and is bored to receive slidably the piston extension K.

Disposed within the chuck F is a chuck bushing O which acts as a guidefor a 1101- low drill steel 1? extending with its rearward end into thepath of thepiston C. The drill steel P in this instance'is provided withwings Q which" interlock with flat portions R formed in the chuck jaw Efor imparting the rotary movement of the chuck mechanism to the drillsteel P. A rifle bar S of a well known type interlocks slidably thevalve V.

with the piston C in theusual manner for tral head Y; for distributingpressure fluid to the rearward and front ends of the cylinder throughinlet passages .Z and 6 respectively; Suitableclosures are provided forthe ends of the valve chamber in the form of plugs 0 havinginwardlyextending pro-, jections alwhich act as abutments or stops forthe valve V. I i 1 Treasure fluid for operating the drill is in thisinstance conveyed to a supply chamber 6 on the valve chest T throughasuitable connection f leading fromta source of pres sure fluid supply(not shown). The admission of such pressure fluid to thevvalve chamber Uis controlled by a throttle valve 9 disposedin this instance rotatablyin the supply chamber 6. A port it in the throttle valve 9 is adaptedtoregister with portj intermediate the ends of the valve chamber U andcontrolled by the centl'alheatl Yof Theouter heads Wand X of the valvein this instance controlling main exhaust ports is and 0 leading fromthe valve chamber U to the atmosphere. a

In accordance with the present invention, a reduced extension 10 of thethrottle valve g to which the controlling lever q is secured is providedwith a bore "1' of smaller diameter than the bore 8 of the throttlevalve g to form a shoulder 25 at the juncture of the bores 8 and r.Disposed within the throttle valve 9 is a blower valve a havmg a stem oextending through the bore 1 of the throttle valve 9. On the outer endof the stem 1: is secured a controlling lever to for rotating the blowervalve. The lever wis preferably spaced a suiiicient distance from theend of the extension 39 to permit limited longitudinal movement of theblower valve u in an inwardly direction for the purpose of avoidingexcessive friction between the cooperating end surfaces of the blowervalve and the throttle. valve during rotation of the blower valve outsome of the dnst and cuttings from the throttle valve g i and both ''of'these ports 2 and 3 are ositioned toregister withapassage 4 leadingfronrthe supply e to a pressure chamber 5 inthe 'end'ofthevalvechan'iber U. V i

During the motmne emesn r the drill,

a certain small portion of the pressure fluid entering the front'end ofthee hnder passes a-lorigthe fluted extension K'o thep stonG through thedrill steel P into the drill hole and, to semeextent, serves to removeor blow drillhole Owing to the short duration oi su ch blowing and theconsequent amount o'f pressure-fluid thus admitted to the drill hole, aconsiderable ateumulation of cuttings is ftirmed rearwardllyof thecuttin g bit of the drill steel. Such cuttings if not removed willgreatly retard the action of the" drill and in time will form a cushionbeneath the drill bit, so that instead of' uttin m a freslr or cleanrook ifaoe, the drill "will strike against the'buttings. In orderktoprevent this objectionable condition the attendant mey,while thethrottle valvegis in its open position, rotate the blower valve u tobring the port. 2 into registry with the port 3in the throttle valve andthus admit pressure fluid from the supply chamber 6 through the passage4 to thepressure chamber 6 the valve chainberU.

Upon the admission of pressure fluid to the pressure chamber the valveVWill be moved rearwardly to the position illustrated in Figure 2. Witlrthe valve V in this posh tionaconstant supply of pressure fluid mayflow directly from the supply chamber a through the ports h and j andthrough the valve chamber between the heads Y and X,

thence through the front inlet passage 2') into v i the frontend of thecylinder A. v a It will be observed that when the valve V is-in itsrearwarc hnost position the rearward end of the cylinder will beopenedto the atmosphere through the inlet passage Z, the

valve chamber U rind the main exhaust port k. The piston C willthenbemoved to the rearward endofthe cylinder by the pressure fluid flowinginto thefront end of the cylinder, thus drawing the :flutedextens ibn Kinto thefront end of the cylinder toallow pres sure fluid to flowthrough flutes J, through tbedrill steel P and intothe drill hole.

After the drill hole has been "thoroughly cleansed the blower valve tomay again be rotated to its closed position where it will be heldagainst accidental rotationby the pressure fluid acting against theinner end of the blower valve. In thisway also the pin will be held inengagement with the depressions z.

I claim;

1. In a fluid actuated rock drill, the combination o f a cylinder havinginlet passages,

a reciprocatory hammer piston in the cylinder, a flntedezrtension on thepistomavalve chest having a valve chamber, a distributing valve in thevalve chamber controlling the inlet passages, a supply chamber on thevalve chest constantly exposed to prostate fluid froma; sourceofsipplyfla passage leudingfrom thesupply chamber to an end of the valvechamber, and avalveinthe supply chamber controlling the full linepressure from the Suppl to one end of the valve-chamberw iereby thedistributing valve is held immovable inthe opposite end of the waluechamber, thus permitting an uninterrupted flow of pres-- sure fluid fromthe valve chamber through,

an inlet passage into' the cylinder and through the front end thereof.

'2. In a fluid actuated rock drill, the cum bination of a cylinderhaving inlet passages, a" 'recipmcwtory hammer piston in the eylin der,a fluted extension on the piston, a valve chest having a valve chamber,a distributing valve in the valve chamber controlling the inletpassages, a supply chamber oathe valve chest constantly exposed topressuie fluid from a source of supply, a passage leading from thesupply ehamberto the-front end oflhefvalve chamber, and it-blower valverotatable in the supply chamber con trolling the-passage for selectivelyadmitting pressure fluid to the front end of valve ehaniber Whereb thedistributing valve is helddmmovabe in the rearward endof the valvechamber, thus Lllredtimr an uninterrupted flow of pressure fluid "f i'omthe valve chamber through an inlet passage to the front end of thecylinder and through the flutesof the extension.

In a fluid actuated rock drill, the 001m bination of acyhnder havingfront and rear inlet passages, a hammer piston in the cylinder, a flutedextension on the piston, avalve chest having a valve chamberhadistributing valve in the valve chamber contmlllngthe inlet passages,asupply chamber on the valve chest constantly exposed to pressure fluidfrom a source of supply, athrottle valve in the supply chambercontrolling the admission of pressure fluid from the supply chamberto-tl1e valve chamber, a passage leading from the supply chamber to the"front end of the valve chamber, and a lllower valve rotatable in thethrottle valve for p assuge for selectively admitting pressure iuidunder chamber selectively admitting pressure fluid through through thefront inlet passage into the the passage to the front end of the valvefront end of the cylinder and through the chamber to hold thedistributing valve imflutes in the extension. 10 movable in the rearwardend of said valve In testimony whereof I have signed this 5 chamberwhile the throttle valve is open, specification.

thus permitting an uninterrupted floiv of pressure fluid from the valvechamber WILLIAM A. SMITH.

